Train-control system and apparatus



Jan. 20, 1931. J. 5. HOLLQIDAY 1,789,465

TRAIN CONTROL SYSTEM AND APPARATUS Filed Sept. 30, 1921 2 Sheets-Sheet lZ maaaaaaaa-uaag 3a fly/m @Z/ ,1 A 2&2

Jan. 20, 1931. J. 5. HOLLIDAY 1,789,455

TRAIN CONTROL SYSTEM AND APPARATUS Filed p 30. 1921 2 Sheets-sheaf 2Patented Jan. 20,. 1931 UNITED STATES PATENT OFFICE-- JOHN S. HOLLIDAY,OF NEW YORK, N Y. J MARGARET HOLLIDAY, ADMINISTRATRIX n 013 SAID JOHNSALISBURY HOLLIDAY, DECEASED, ASSIGNOR TO MATTHEW LOUGHRIDGE, TRUSTEE,OFQBOGOTA, NEW JERSEY I TRAIN-CONTROL SYSTEM AND APPARATUS Applicationfiled September 30, 1921. Serial No. 504,436.

This invention relates to train control systems and the apparatus usedin connection therewith and has for an object to provide a system oftrain control which is operated by electromagnetic induction fromdevices located on the track coacting with devices located on thelooomotive anda further object of this invention is the use of a deviceknown as the magnetron used as a medium for receiving an electricaleffect from the track device, thereby securing a system which is highlysensitive, operative through a wide margin of safety and operating witha high degree of efliciency and reliability, which are essentials forapparatus of this kind. These and other objects of this invention willbe understood from the following specification and the accompanyingdrawings in which Fig. 1, is an outline drawing showing the workingprinciples of the magnetron as applied in the present invention toproduce a retarding effect on the locomotive, Fig. 1a, is a sectionaldetail with referenceto Fig. 1, Fig. 2 is a side elevation of the trackdevice, Fig. 3 is a plan view of the apparatus shown in Fig. 1, completewith the magnetizing coil in place, Fig. 4 is another form of magnetronand applied to give a proceed signal to the locomotive, F'g. 5 is anelevation of the track device as shown in Fig. 2, F ig'. 6 is adiagrammatic "iew showing the principles of the operation of theapparatus in Fig. 4, Figs. 7 and 8'are details indicating theprinciple-s of operation of the apparatus with reference to'Fig. 6, Fig.

9 is a wiring diagram of one method of ap-- plying the apparatus on thelocomotive, and Fig. 10 is a wiring diagram of the apparatus as it maybe installedin the track.

' The system its-disclosed in this invention includes means forcommunicating proceed,

caution and stop signals to the ;-.locomotive,

also in combination with-'the stop signal a means is provided foroperating the brake apparatus. The present invention does not disclose asystem of speed control, although the apparatus itself can be readilyadapted for this purpose to any of the well-known speed control systemsheretofore proposed either using a centrifuge device or a de iceoperating on a time. interval basis from'track devices of varyinglengths.

The effects which operate the signal apparatus on the locomotive arecommunicated from the track according to track conditions byelectromagnetic induction and the apparatus may be described under twoheadings, i'. e., that which produces a retarding or stop effect on thelocomotive, known as the stop apparatus and that which produces aproceed efiect on the locomotive known as the proceed apparatus. Thestop and proceed apparatus make use of a device known as a magnetronwhich is a vacuum tube device, responsive to the principles ofelectromagnetic induction and the track device is provided with asuitable apparatus to influence both the stop and in which'll and 12 aretwo parallel bars of magnetic iron placed on the track, parallel withthe running rails and having at intervals a'core 13 connecting the poles11 and 12, apd provided With a coil 14. Any number 0 these coils may beprovided and may be connected in series or in series multiple.

-' For the purpose of the present invention the coils are so'connec'tedthat one of the mag; netic bars becomesa north pole and theother becomesa south pole whenthe coils are en-. .ergized and when these coils aredeenergized, there is no ma etism in these bars; The track device is soped or ramped at each end and is sometimes'ji'eferred to as a trackramp, although no physical contact is made hetween it and the locomotiveapparatus, for

the purpose of the present invention.

The stop apparatus will be understood by v a study of Figs. 1, 1a and 3.This consists of a glass tube 21 which has been vacuumed and placedbetween the poles 16 and. 18. Pole 16 has an extended pole piece 15',arranged to intercept the vertical plane of the magnetic bars 11 and 12,as indicated in Fig. 3 and the ole 18 has a corresponding pole piece 17hese pole pieces are heldin position with respect to each other by thenonmagnetic bars 19 and 20. The glass tube 21 is provided with ametallic cylindrical anode 24 and a filament 23, passing through thecentre; also with a magnetizing coil 22 on the outside. The operation ofthe apparatus requires that the filament or cathode be heated and forthis purpose as well as for energizing coil 22, the battery 26 isprovided having one pole connected to the cathode wire 23 and the otherpole connected to coil 22.'- The opposite end of 'coil 22 connects tothe opposite end of the cathode wire. This arrangement, therefore,connects battery 26 in series with the cathode wire and the magnetizingcoil 22, thus maintaining the temperature of the cathode and creating amagnetic flux in the tu e.

Relay 30 connects by wire 29 to the cathode 23 and by wire 28 connectsto battery 27 and to the anode-24. If, therefore, a circuit isestablished" between the anode and the cathode inside the vacuum tube,relay 30 will be energized from battery 27 and if thiscircuit isinterrupted, -relay 30 will' be deenergized. I

A well-known principle of vacuum tubes is that when the cathode isheated and a; voltage is impressed between the anode and cathode, acircuit is established between them as occurs in the present case,between 23 and 24. This circuit, however, is influenced b an exteriormagnetic field in the following manner: p

When the magnetic flux generated by the coil 22 is below a certaincritical value, the electrons discharged from the cathodeatraverse apath as indicated by the dotted lines in the lower illustration in Fig.1a. When, however, the flux generated in coil 22 exceeds this criticalvalue, the electrons" traverse paths similar to the upper illustrationin Fig. 1a. In the former case it'will be noted that the electrons passfrom the" cathtyde to the anode and therefore establish a cireui but inthe latter case, they turn back; upon themselves and do not reach thefiIlOde and theres fore fail to establish a circuit. Thelch a'ngefromone of these conditions to the other in practice occurs abruptly so thatthe operation of the apparatus is reliable and efficient at the criticalvalue the paths of the electrons becoming tangent'togthe anode.

The illustrationainFi'g. 3 showsthe vacuum tube inserted in jaws formedin the poles 16 and 18. This is for convenience in inspecting andreplacing tubes. The coil 22 generates a flux which energizes the poles16 and 18 and also'the space between these poles. This flux, however, isbelow the pre- I determined value which will open the cir cuit betweenthe anode and the cathode. As soon, however, as the pole pieces 15and'l'l' pass through the vertical planes of the magnetic plates 11 and12, the flux from the magnetizing coil 22 is thereby greatlystrengthened, due to the reduction in the air gap between these poleieces. This in turn increases correspondmgl. the flux throughthe vacuumtube 21, there y setting up the conditions which cause the circuit toopen between the anode and the cathode and thus deenergizes the blockrelay 30, during the time that this device is passing over the trackramp. The track-ramps are usually placed on a higher plane than the top.of the running rails so that when this device passes over the railsthemselves at across-over or switch, the air gap is so much greater thatthe device is not, falsely operated thereby.

The? magnetron illustrated iii Fig. 4 is appole 38 having the pole piece37, aligning with the magnetic plate 12. These poles are held inalignment by the non-magnetic bar 39. Between these pole pieces thevacuum tube 31 is placed, having a hot wire cathode 42 and two'separatesets of anode plates 44 and 45 which are insulated from each other bythe 'insulation 43. These are spaced around t e'tube as indicated inFig. 6. Thecathode connects to wire 52, battery 55 and by wire 56 to theother end of the cathode, thus permanently heating the cathode wire fromttery 55 as indicated in Fig. 4. Relay 53 it will be noted, has adifferential winding, the central point connecting by wire.50 to battery51 and the other side of this battery connects by wire 52 to the cathode42. One end ofthe differential winding connects by wire 48 to the anode44 and the other end of the differential winding connects by wire v49 tothe anode 45. If a circuit is established from the anode to each of thecathodes then each coil of the differential winding will be ,equallyenergized thereby neutralizing each other and the armatures of'thisrelay will not be moved. On the other hand, if a circuit is establishedfrom the cathode to the anode" 44, then relay 53 will be energized witha certain polarity, attracting the neutral armagture 61 and moving thepolarized armature 62 in accordance with the. polarity of themagnetizing coil. Also, if a circuitisestab' lished from the cathode 42to the anode '45, relay 53 will be energized with opposite polarity bythe other coil, attracting armature 61 and moving the polarized armatureinto the opposite position. The-first condition is established asindicated in Fig. 6, when the electrons pass from the cathode 42 inequal numbers to each set of anode plates 44 and 45, as shown by thedotted lines.

From Fig.6, it will be hoted that all the anode plates 44 on one side ofthe insulation 43 are connected in multiple to the wire 46 and all theanode plates 45 -on the opposite side of this insulation are connectedin multiple to the wire 47, connecting respectively to the wires 48 and49 which are the leads of the differential relay 53.

The path of' the electrons is influenced by the magnetic-lines of forcein a manner similar to the conductors in a motor armature, generallyknown as Flemings rule. A magnetic field inone direction causes theelectrons to traverse curved paths so that when they pass fromthe'cathode 42' to the anode 45, for instance, as illustrated in 7, theyare moved away from the anode 44,

and when the magnetic field is in the reverse direction, they traversepaths as illustrated in Fig. 8, from the cathode 42 to the anode 44 andmove away from the anode 45.

The application of this principle will be understood by considering thetrack magnet in Fig. 5, in combination with the arrangea ment shown inFig. 4. When the coil 14 is energized, for instance, a magnetic flux isimpressed upon the pole-pieces and 37 by electromagnetic induction,thereby setting up a field between the poles 36 and 38. When the pole 36is energized with north polarity then the electrons may set up thecondition corresponding to Fig. 7, establishing acircuit between thecathode 42 and the ,anode and when pole 38 is energized with north,

polarity,-this'may set up the conditions corv responding to Fig.- 8,establishing a circuit between the cathode 42 and the anode 44. It willthus be noted that under normal conditions, when the magnetron 41 is notover a ramp or is passing over a deenergized ramp, the electrons passequally between the cathode and the two sets of anode plates,thussetting up a circuit in the difi'erentiahrelaiy which neutralizesitself.

. As soon as this magnetron passes over a ramp energizing the pole 38with north polarity,

then the circuit between the cathode and the anode 4 5, is interruptedand aicircuit isestablished between the cathode and the anode 44, thusenergizing the other coil of the differential relay and therebyreversing its polarity. The arrangement is thus equivalent to apolarized system, operating the relay, however, without contacts andwith a high degree of reliability, notwithstanding the large air gaps inthe magnetic circuit of the poles 36 and 38. Should the magnetism of thetrack magnet 14 become excessive, the electrons might establish acondition similar to Fig. 1a,, (top view) this however, is very unlikelyto occur due to the air gap in the circuit of=the track magnet. If itdid occur it would merely deenergizerelay 53 and pre vent a clearsignal. being received."

It will be noted in connection with the stop" device shown in Figs. 1and 1a that the cylindrical anode 24 has a gap on the lower side 25,beneath the cathode wire 23: An objectof this gap is to guardagain's't'the' wire 23, making a short circuit with the" anode 24 incase the wire should become broken.

is connected in series with the cathode wire 23 so that in case'themagnetizing coil is disconnected, the cathode is deenergized and coolsofi' and thus becomes inoperative to establish a circuit.

The application of these devices on a locomotive will be understood by astudy of the circuit arrangement shown in Fig. 9. In this 'case aproceed device is placed on each side tiple arrangement also insuresless resistance in the'o erationiof the circuits. The central point 0differential relay 53 connects to hate tery 51- and by wire 52connectsto the'cathodeof each of the proceed devices. Wires 48 and 49connect each of the outer ends of the coil windings of relay 53 to thetwo sets of anodes The broken ends in this case, will fall through thegap to the glass walls of the tube. Also, it will be noted that themagnetizing coil 22 ion of the proceed devices as shown in Fig. 4.

This causes relay 53 to be energized when proceed'devices' pass over anenergized ramp and also causes the ,polarized armature 62 to respond tothe direction of polarity in the track device. Itshould be noted thatrelay 53 is herein regarded as deenergized when the neutral contacts6161a are inthe lowered position. e

Relay30 as shown in Fig. 9 has a stick circuit and a pick-u circuit. Thepickup circuit can be traced rom wire 72, battery 27, wire 71, contact,61 of relay 53 and wire 73.

' This picks up relay 30 each time that relay 53 closes contact'61: Thestick circuit for this relay canbe traced from wire 74, contact 75 ,wire76,'stop'device 21and wire 77 to wire 71. As long as a circuit isestablished between wires 76 and 77, through the stop device 21, relay30 remains energized. It has been shown, however, that this circuit is.interrupted'each time the stop device passes over the magnetic plates ofa track ramp. Thus, the stick circuit for relay 30 is inter rupted oneach' track ramp encountered and the pick-up circuit must be establishedat each ramp in order tomaintain the proceed effect. This is a circuitarrangement commonly used in systems of this kind. 89 is a cab signaldevice energized by wire 80, battery 81, wire 82, contact 83 of relay 30when said relay is energized, wire 84, contact 61a of relay 53deenergized, polarized contact 62 in the right hand position, wire 85 tothe green light G, thus giving a proceed signal. Another circuit isestablished when the polarized armature 62changes to the oppositeposition through wire 86 to the yellow light Y and a third circuit isestablished when relay 30 is deenergized through wire 87, to the redlight R. This gives a green or proceed signal when relay 30 is energizedand the armature 62 has been moved to a predetermined position, a yellowor caution signal, when relay 30 is energized and the armature 62 hasbeen moved to another predetermined position, and a red or stop signalwhen relay 30 is deenergized. Thus, the signal device 89 is operated inresponse to the characteristics of the current energizing the trackwaydevice 14.

-An arrangement may be provided in combination with this system foroperating the train brakes. including the brake valve 88 operated bymagnet yoke 120 energized over a circuit including wire 80, battery 81,wire 82, contact 83 and Wire 84. This magnet re mains energized andholds the valve 88 closed" while a proceed orcauti-on signal isestablished but is deenergized and opens the valve when a red or stopsignal has been retceived. Various combinations in the applica ion ofthe brake valve are usually'adopted to meet the operating condition of arailroad and are sufliciently well-known without being illustrated indetail in connection with the present invention. Armature 121 rotatesbetween the poles of the yoke 120 and carries a crank which raises arm123 to close the valve when in the position shown in full lines but whenin the position shown by the dotted lines,

this valve is opened. A-counterweight 124 is provided on the crank armgiving it a bias to the dotted position. It will be noted that thisarmature will take up a position on either side of the vertical centrewhen the yoke is? energized and in normal operation when deenergizedtakes up the dotted position to be held in this position after the yokeis energized. For the purpose of closing the valve therefore, a manuallyoperated resetting plunger 122 is provided which engages the crank armand swings the armature into the position shown by the full lines whereit is held as long as the yoke is'energized. A quick stroke of plunger122 gives the aims,- lure its initial start but the inertia of thearmature carries it over the vertical centre to the position shown,which closes the valve.

By this arrangement it will be noted that each time the yoke 120 isdeenergized the valve is opened and remains open after this yoke isenergized again until it is manually reset: also that if the resettingplunger were held in the released position it would not prevent thevalve from opening. It should be noted that by controlling the proceedand caution signals through a back contact of relay 53, that in casethis relay should become energized improperly, this will immediatelyextinguish the proceed or caution signal.

The track arrangement is illustrated in relay 97. WVhen this contact isin one posi-.

tion, the coil 14 is energized through wire I 112 from battery 107 andwhen contact 106 is in the opposite position, coil 14 is energized frombattery 108. Opposite poles of batteries 107 and 108 are connected towire 112,

thereby changing the direction of current to coil 14 in accordance withthe position of contact 106. Line relay 97 connects to the cominon wire98 and is controlled by wire 99,

contact 100 of track relay 94, wire 101 and contact 102 of the trackrelay for the next succeeding block, wire 103 and battery 104.

This causes contact 106 to move to one position and when the track relay94 for the next succeeding block is deenergized, contact 102 connects tobattery 105, having. opposite polarity to battery 104, thereby changingthe position of contact 106 and thus changing the polarity of thecurrent energizing coil 14. When the track relay for theblock'immediately in advance of the ramp is deenergized, the circuit ofcoil 14 isinterrupted at contact 110, and consequently the ramp isdeenergized so as to cause a stop signal; when this block is clear andthe next succeeding block is occupied the polarity of the current in theline relay 97 is in a direction to energize coil 14 with a polaritywhich will'give a caution signal. When the two blocks immediately aheadof the ramp are clear, the polarity to the coil 14 is in the properdirection, I

to 'give a proceed signal to the locomotive apparatus. A

The device on the vehicle responsive to the track devices has beendesignated the magnetron as its operation is associated with magnetism.This magnetism is obtained from the track by induction and in thedrawing's a magnetic ramp 11 is shown by means of which the ma neticfield on the track is translated to in uence the vehicle devices.

It is. apparent that the magnetron will re--- spond to a magnetic fieldfrom any source and 'is'not limited to the particular fype of magnetshown. A magnetic field therefore that is controlled corresponding tomagnet 11 is the equivalent of this device and should be so understoodin the specification and claims.

This invention shows certain novel appli- The form of my inventiondescribed includes certain novel arrangements of apparatus on the trainand certain novel con-' structions on the trackway. To someextent' thetrackway apparatus co-operates with the specific locomotive apparatusshown, but in general, the locomotive apparatus can be applied with avariety of types of trackway apparatus such as will produce thecontrolling effects on the locomotive .apparatus described; also, thetrackway apparatus may be used to operate other arrangements oflocomotive apparatus from that shown, it is to be understood, therefore,that this invention covers a full range of equivalents for the apparatusand arrangements shown, both on the t'rackway and on the train, and isnot to be limited except as defined in the claims.

Having thus described my invention, I claim:

1. In combination, a railway track, a vehicle thereon, a magnetic deviceon said track, a vacuum tube device on said vehicle coacting with saidtrack device and a circuit on said vehicle associated with said vacuumtube.

a 2. In combination, a railway track, a vehicle thereon, a magneticdevice on said track, a vacuum tube device on said vehicle responsive tothe magnetism of said track device and a circuit on said vehicleassociated with said vacuum tube device.

3. In combinatlon, a railway track, a vehicle thereon, a magnetic deviceon said track,

a vacuum tube device on said vehicle responsive to the magnetism of saidtrack device, an inactive translating device associated with the circuitof said vacuum tube device and means for rendering said translatingdevice active by the magnetism from said track device.

hicle thereon, a magnetic field on said track, a'vacuuin tube device onsaid vehicle, a circuit on said vehicle associated with said vacuum tubedevice, a translating device energized 4. In combination, a railwaytrack, a ve-' only by said circuit and means for operating saidtranslating device in response to the polari'ty of the currentenergizing said field.

5. In combination, a' railway track, a vehicle thereon, a magneticdevice on said track, a vacuum tube device on said vehicle, a circuit onsaid vehicle associated with said vacuum tube device, a polarized relayoperatively connected with said circuit, said relay responding to thepolarity of the current.

6. In combination, a railway track, a vehicle thereon, a magnetic deviceon said track, a vacuum tube device on said vehicle, a circuit on saidvehicle associated with said vacuum tube, a relay operatively connectedwith said circuit and means for controlling a circuit by said relay whensaid vacuum tubedevice is ma netized fromsaidt rack device.

7; In com ination, a railway track, a vehicle thereon, a magnetic deviceon said track, a vacuum tube device on said vehicle coacting with saidmagnetic device, a circuit associated with said vacuum tube device andmeans for 'deenergizing said circuit when said! vehicle device passesthrough the vertical plane of said track. device.

8. In combination, a railway track, a vehicle thereon, a magnetic deviceon said track, a vacuum tube device on said vehicle, a coil formagnetizing saiddevice, a circuit on sald vehicle associated with saidvacuum tube device and means for deenergizing said circuit when saidvehicle device comes under the influence of, said track device.

9. In combination, a railway track, a vehicle thereon, a vacuum tubedevice on said vehicle, means for impressing a magnetic flux on saidvacuum tubedevice, a circuit associated with said vacuum tube and meanson said track affecting said magnetic flux, whereby said circuit'isdeenergized.

10. In combination, a railway track, a vehicle thereon, a vacuum tubedevice on said vehicle, a circuit associated with said vacuum tube,a'device on said track and means for impressing a magnetic flux fromsaidtrack device upon said.vacuum tube device, thereby afl'ecting theoperation of said cirf cuit.

11. In combination, a railway track, a vehicle thereon, a vacuum tubedevice on said vehicle having apair of poles, a circuit asso-v ciatedwith said vacuum tubedevice, a device on said track and means formagnetizing said poles from said track device, thereby affecting theoperation of said circuit.

' 12. In combination, a railway track, 9. vehicle thereon, a vacuum tubedevice on said vehicle having a pair of poles, a circuit asso--, ciatedwith said vacuum tube device, a device on said track having a pair ofpoles and means for magnetizing the poles of said vehicle device in resonse to the oles of said track device, there y affecting t e operationof said circuit.

, 13. In combination, a railway track, a vehicle thereon, a vacuum tubedevice on said vehicle, said device having a separate pair of anodes anda cathode, circuits'with a translating device associated with each ofsaid anodes and said cathode, a magnetic device on said track and meanswhereby the magnetism .of said track device afiects the operation ofsaid translating device.

14. In combination, a railwa track, a vehicle thereon, a vacuum tubeevice on said vehicle, said device having a separate pair of anodes anda cathode, circuits associated with each of said anodes and saidcathode, a magnetic device on said track and means whereby -themagnetism from said track device interrupts the circuit'from one of saidanodes to said cathode.

15. In combination, a railway track, a vehicle thereon, a vacuum tubedevice on said vehicle, said device having a separate pair of anodes anda cathode, circuits associated with each of said anodes and saidcathode, a magne'tic device on said track and means'whereb magnetism ofone polarity from said trac device will interrupt the circuit from oneof' said anodes to said cathode and magnetism of the opposite polaritywill interrupt the cir- .cuit from the other of said anodes to saidhicle thereon, a vacuum tube device on'said vehicle, said device havinga pair of longitudinal anodes se 'arated by an insulating plate and acatho e, circuits associated with each of said a'nod'es and saidcathode, a device tudinal anodes se arated by an insulating on saidtrack and means for controlling said track device whereby the circuitbetween said cathode and either of said anodes may be interrupted. I

18. In combination, a railwa track, a vehicle thereon, a vacuum tubeevice on said vehicle, said device having a pair of longis plate and acath e, circuits associated with each of said anodes and'said cathode,a. differential rela device on sai track and means for controlling saidtrack device whereby the current in either side of s'aid'difi'erentialrelay may be increased over the current in the other side.

' 19. In combination, a railway track, a vehicle thereon, a vacuum tubedevice on said vehicle, said device having a separate pair of anodes anda cathode, a differential relay, one

included in said circuits, a-

winding of said relay connecting to each of said anodesv and the neutralpoint of said windingconnecting to said cathode and to 'a battery andmeans on the track for varying the current to each winding of saidrelay.

20. In combination, a railway track, a vehicle thereon, a vacuum tubedevice on said vehicle, said device having an anode. and a cathode, acoil for supplying a magnetic field for said device, said coil connectedin series with said cathode, a circuit associated with said anode andcathode and means on the track for varying said magnetic field.

21. In combination, a railway track, a vehicle thereon, a vacuum tubedevice on said vehicle, said device having an anode and a cathode, acoil for supplying a magneticfield for said device, means whereby saidcoil is deenergized when said cathode is disconnected, a circuitassociated with said anode and cathode and means on the track forvarying said magnetic field.

22. In combination, a railway track, a vehicle thereon, a vacuum tubedevice on 'said vehicle, said device having an anode and a cathode, acoil for supplying a magnetic field for said device, said device havingacylindrical anode with a longitudinal gap in its lower side, a cathodein the centre of said anode, a circuit including a translating deviceassociated with said anode and cathode, a magnetic device on the trackand means whereby said track device varies the current in said circuit.

23. In a railway traflic controlling system, in combination, a'railwaytrack, a vehicle thereon, amagnetic device on said track controlled bytrafiic conditions, a vacuum tube device on said vehicle having acircuit, said vacuum tube device coact-ing'with said magnetic device, acontrol deviceasso'ciated with said circuit and means for Boperatingsaid control device from said track device.

I 24. In a railway trafiic controlling system in combinatiom a'railwaytrack, a vehicle thereon, a device on said track controlled by ,trafiicconditions, a vacuum tube device on said vehicle having magnetizingmeans and a circuit, a control device associated with said circuit andmeans for operating said control device to control said vehicle by saidtrack device. I

' 2'5. In a railway traflic controlling system, in combination, arailway track, a vehicle thereon, a device on said track, a vacuum tubedevice on said vehicle having magnetizing means and a circuit, a stickrelay associated with said circuit 'and means for deenergizing saidstick relay by said track device.

26. In a railway'traific controlling system, in combination, a railwaytrack, a vehicle thereon, a magnetic device on said track con trolledbytrafiic conditions, a vacuum tube device on said-vehicle coacting withsaid Cal track device, a circuit including a stick relay associated withsaid vacuum tube device, and means for energizing said stick relay whensaid track device is magnetized.

27. In a railway trailic controlling system, in combination, a railwaytrack, a vehicle thereon, a magnetic field on said track, a plurality ofvacuum tube devices on said vehicle, a circuit associated with each ofsaid devices, a translating device.controlled by said circuits, saidvacuum tube devices responsive to said magnetic field whereby one ofsaid tubes deenergizes said translating device and the. other energizessaid translating device. i

i 28. In a railway trafiic controlling system, in combination, a railwaytrack, a vehicle thereon, a device on said track, a plurality of vacuumtube devices on said vehicle, a stick relay onsaid vehicle having apick-up circuit and a stick-u circuit, the pick-up circuit associatedwith one of said vacuum tube devicesand the stick-up cirbuit associatedwith the other vacuum tube device, means whereby the said stick-upcircuit is opened and the pick-up circuit is closed when aid tu'bedevices pass' over said 'trackdevice;

29. In a railway traflic control-ling system, in combination, a railwaytrack, a vehicle thereon, a device on said track controlled by trafficconditions, a controlling mechanism on said vehicle, a vacuum tubedevice on said vehicle controlling said mechanism to retard said vehicleand another vacuum tube device.

controlling said mechanism to produce a nonretarding condition on saidvehicle, said vacuum tube devices responding to said track device.

' 30. In a railway tralfic controlling system, in combination, a railwaytrack, a vehicle thereon, a magnetic device on said track controlled bytraffic conditions, a controlling mechanism on said vehicle, a vacuumtube device onsaid vehicle controlling said mechanism to retard saidvehicle and another vacuum tube. de'v,ice controlling said mechanism toproduce a non-retarding condition on said vehicle, said first vacuumtube device responding to said track device and said second vacuum tubedevice responding to the magnetism of said track device.

31. In a railway trafiic controlling j'systeln,

in-combination, a railway track, a vehicle thereon, a magnetlc field onsaid track controlled by traflicY-conditions,'acab signal on saidvehicle, avacuum tube device, a circuit associated-with said vacuum tubedevice, a

translating device energized solely said circuit controlling said signaland arranged to give a proceed indication when saidtrack field ismagnetized with one polarity and to give a caution .signalwhen saidtrack field is magnetized with opposite polarity.

32, In a'railway trafiic controlling system,

iii combination, a railway track, a Vehicle thereon, a magnetic deviceon said track controlled by traflic conditions, a cab signal on saidvehicle, a vacuum tube device on said vehicle responding to said trackdevice, causing said signal to givea stop indication, and another vacuumtube device on said vehicle responding o the magnetism in said trackdevice to give a caution or clear signal.

33. In a railway trafiiccontrolling system, in combination, a railwaytrack, a vehicle thereon, a device on said track controlled by trafiicconditions, a controlling mechanism on said vehicle having a retardingand a nonretarding condition, a vacuum tube device on said vehicleresponding to said track device and meanswhereby said Vacuum tube devicecoacti'ng with said track device establishes the'aretarding condition insaid mechanism. v

34. In a railway traflic controlling system, in combination, a railwaytrack, a vehicle thereon, a device on said track controlled by traflicconditions, a controlling mechanism on said vehicle having a proceedcircuit and a stop circuit, a vacuum tube deuum tube device, theindication of said signal' being controlled by the contacts of saidrelay when in its neutral condition.

. 36. In a railway traflic controlling system, in combination, a railwaytrack, a vehicle thereon, a device on said track controlled by trafficconditions, a cab signal on said vehicle, a vacuum tube device on saidvehicle responding to said track device, 'a differential relayassociated with said vacuum tube device, said differential relay havinga neutral armature and means for detecting if the neutral armature ofsaid relay is in the raised position when said vacuum tube device is notunder theinfluence of said track device.

37. In a railway traflic controlling system, in combination, a railwaytrack, a vehicle thereon, a magnetic field on saidtrack controlled. bytrafiic conditions, a? vacuum tube device on said vehicle, controlling acircuit, said device responsive to said track field and means controlledsolely by said'circuit for obtaining one effect on said vehicle when'said track field is energized by. current of one polarity and forobtaining a different effect when it is energized by current ofoppositepolarity.

hicle thereon,-a device on said track controlled by traffic conditions,a device on said vehicle responsive to said track device, a brake valvecontrolled by said locomotive device, and a manually operated mechanismfor partially closing said valve and operat ingin combination with theinertia of said valve for closing the same.

40. In a-railway'traflic controlling system, in combination, a railwaytrack, a vehicle thereon, a device on said track controlled by trafiicconditions, a device on said vehicle responsive to said track device, anelectrically operated brake valve consisting of a rotating armaturebetween a pair of poles, said armature having a neutral zone on a linebetween said poles and when movedbeyond this line in one direction, saidvalve is opened and when moved in the opposite direction, said valve isclosed, said valve being controlled by said vehicle device.

41. In a railway traflic controlling system, in combination, a railwaytrack, a vehicle thereon, a device on said track controlled by traflicconditions, a device on said vehicle responsive to said track device, anelectrically operated brake valve consisting of a rotating armaturebetween a pair of poles, said armature having a neutral zone on a linebetweensaid poles and biased to move beyond this line to open said valveand means for manually resetting said armature to the opposite. positionto close said valve, said valve being controlled by said vehicle device.

42. In combination, a railway track, a vehiele thereon, a vacuum tubedevice on said vehicle, said device having an anode and a cathode, acoil for ,supplying a magnetic field for said device, means whereby saidcoil is deenergized when said cathode is broken, and a circuit on saidvehicle as sociated with said anode and cathode.

43., In a railway traflic controlling system, in combination, a railwaytrack, a vehicle thereon, a device on said track, a vacuum tube deviceon said vehicleiresponsive to said track device, a circuit associatedwith said 'vacilum tube device and adircct current polarized re:

lay operated by said circuit.

44. .In a railway trafic controlling system, in combination, a railwaytrack, a vehicle thereon, a device on said track, a vacuum tube.windings with a device on said vehicle responsive to said track device,a circuit associated with said vacuum tube device and a relay havingopposing windings operated by said circuit.

45. In a railway traflic controlling system,

in combination, a railway track, a vehicle thereon, a device on saidtrack, a vacuum tube device on said vehicle responsive to said trackdevice, a circuit associated with said vacuum tube device and a relayhaving opposing by said circuit. v

46. In combination, a railway track, a vehicle thereon,a magnetic fieldon said track controlled by traflic conditions, a plurality of vacuumtube devices on said vehicle independently responsive to said trackfield, a circuit associated with both of said vacuum tube devices and atranslating device operated solely by said circuit to the proceedposition.

,47. In combination, a railway track, a vehicle thereon, a magneticfield on said track, a plurality of vacuum tube delices on -.said

vehicle responsive to said track field, said tube devices arran ed tocontrol a direct current circuit in mu t1 lo and a translating deviceoperated by sa1 circult.

'48. In a railway traflic controlling system, i

in combination, a railway track, a vehicle thereon, a device on saidtrack controlled by taflic conditions, a vacuum tube device on saidvehicle responsive to said track device and controlling a circuit, and atranslating device operated by said circuit, said translating devicehaving a polarized element and a neutral element 'and capable of takingup either of two positions when said translating device is energized.

polarized armature operated 49,. In a railway trafiic controllingsystem,

in combination, a railway track, a vehicle thereon, a device on saidtrack controlled traflic conditions, a vacuum tube device on saidvehicle responsiveto said track device and controlling a circuit, atranslating device operated by said circuit, said translatingdevicehaving a polarized element and a neutral element, one of said elementscapable oftaking up either of two positions and means for positioningsaid element.

in combination, a railway track, a vehicle thereon, a device on saidtrack controlled by traflic conditions, a device on said vehicle responsive to said track device and controlling a circuit, a translatingdevice operated by said circuit and havin an element capable of takingup either 0 two positions and means in combination with the inertia,ofsaid element for moving it to a predetermined position.

51. In a railway trafiic controlling system,

in combination, a railway track, a vehicle thereon, a device on saidtrack controlled-by trafiic conditions, aidevice on said vehicleresponslve to said track dev1ce,..a signaling de- 50. In a railwaytraflic controlling system,

vice on said vehicle, a differential relay having opposing windingscontrolled by said vehicle device and controlling a stick relay, saidstick relay controlling said signal device.

52. In a railway traflic.controlling system,

in combination, a railway track, a vehicle thereon, means on said trackcontrolled by trafiic conditions, a device on said-vehicle responsive tosaid .track means operating a translating device, said translatingdevice comprising a pair of poles, an armature pivoted between saidpoles, said armature having a neutral zone on a line between said polesand capable of being positioned on either side of, said neutral zonewhen said poles are enere 53. In a railway trafiic controlling system,in combination, a railway track, a vehicle thereon, means on said trackcontrolled by traffic conditions, a device on said vehicle responsive tosaid track means operating a translating device, said translating devicecomprising a pair of poles, an armature pivoted between said poles, saidarmature having a neutral zone on a line between said poles,

means for positioning said armature and meansfor magnetizing said polesto hold said armature in position.

54. In a railway trafiic 'controling system, the combination of arailway track, a vehicle thereon, means on said track controlled bytrailic conditions, a device on said ve- "hlcle responsive to said trackmeans, a relay with opposing windings controlled by said device, andmeans for varying the current in both of said windings by said trackmeans.

55. In a railway trafiic controlling system,

the combination of a railway track, a vehicle thereon, means on saidtrack controlled by trailic conditions, a device on said vehicleresponsive to said track means, a relay with opposing windingscontrolled by said device, said relay having two independent armatures,one .of' said armatures positioned by the difierence of the currents insaid windings and the other armature being attracted when said relay isenergized.

. 56. Ina railway traflic controlling system, the combination of arailway track, a vehicle thereon, means on said track controlled bytraflic conditions, adevice on said vehicle responsive to; said trackmeans, a relay with oppqsin windings controlled. by said device, sairelay controlling a circuit and hav-' ing two independent armatures, oneof said armatures positioned b the difference ofv the currents in saidwin ings, said armatures k controlling said circui in series.

57. In a railway tra c controlling system, the combination of a railwaytrack, a vehicle thereon, .means on said track controlled by trafiicconditions, a device on said vehicle responsive to said track means, acontrolling circuit, a relay having'two independent armatures one ofsaidarmaturespositioned by the difl'erence of the currents in said windingsand controlling saidcircuit and the other armature controlling saidcircuit in the deenergized position.

58. In a train control system, in combination, a vehicle carriedmechanism including an electron discharge device and roadside mechanismfor magnetically influencing the electron discharge device for-producingany one of'three difierent indications in the vehicle carried mechanismz59. In a train control system, in combination, vehicle carried mechanismincluding a magnetron means and roadside mechanism for magneticallyinfluencing the magnetron means for producing any one of three differentindications in the vehicle carried mechanism.

60. In a train control system, in combination, vehicle carried mechamsm.including 61. In a'train control system, in combi-v nation, vehiclecarried mechanism including means operable for placing the train under aspeed re'striction and an electron dis charge device of which a magneticfield is a controlling component for controlling the operation of saidmeans, and roadside mechanism for influencing the electron dischargedevice for producing the speed restricting operation thereof.

62. In a train control system, in combination, vehicle carried mechanismcomprising means movable into three different positions for producingclear, caution and danger train indications and instrumentalitiesincluding a magnetron for controlling the operation of saidmovable'means, and road;

side mechanism operable in accordance with clear, caution and dangertrack con-- ditions formagnetically influencing said deproducing anyofsaid train indications.

a n e e a v vice and for operating said instrumentalities 63. In a traincontrol system, in combination, vehicle carried mechanism includingmeans selectively operable for placing the train-under a speedrestriction andfor permitting unlimited speed thereof and a mag-fnetron'for controlling the operation of said means, and roadsidemechanism for mag-.

netically infiuencin the magnetron for producing the controllingoperations thereof.

64. In a train control system, in combination, vehicle-carried mechanismincluding means operable for placing the train under a speed restrictionand an electron discharge device of which a magnetic field is acontrolling component operable for controlling the operation of saidmeans.

65. In a train control system, in combination, vehicle carried mechanismincluding means operable for placing the train under a speed restrictionand a magnetron for controlling the operation of said means.

66. In combination, a vehicle circuit including an electron dischargedevice of which a) magnetic field is a controlling component androadside mechanism for, influencingthe said device for affecting thecircuit.

67. In combination, a vehicle circuit including an electron dischargedevice of which a magnetic field is a controlling component and roadsidemagnet mechanism'for magnetically influencing the said device foraffecting the circuit.

68. In combination, a vehicle circuit including'a magnetron and roadsidemechanism associated therewith for controlling the eluding a normallyopen thermo-ionic device of which a magnetic field is a controllingcomponent and roadside mechanism operative magnetically thereon forclosing the same.

7 2. In combination, a railway track, a vehicle thereon, a vacuum tubedevice on said vehicle having poles, a circuit conn'ected'gto theelectrodes of said tube, said circuitxestablished when said tube isunder the influence of a magnetic field, a. circuit for energizing saidpoles and means on thetr'ack for increasing the magnetic field throughsaid tube.

73. In combination, a railway track, a vehicle thereon, a ma netic rid eon said track, a vacuum tube devlce -on sai vehicle having a pair ofpoles, acirc-uit connected to theelectrodes of said tube and establishedwhen said tube is under the influence of a magnetic field, means forenergizing said poles and means on the track for increasing the neticflux through said tube. n

74. A railway traflic controlling system comprising a magnetron, trafliccontrolled means fdr magnetically afiectingthe electrical conductivityof said magnetron, and traflic governing means controlled by saidmagnetron.

75.='A railway traflic cont-rolling system comprising a magnetron, meanscontrolled by current in the trackflrail for magnetically.

affecting the electrical conductivity of said magnetron, and traflicgoverning means con-v trolled by said magnetron.

magi.

76. In combination, railway traflic governing mechanism includin amagnetron, and trafiic controlled means %or magnetically influencingsaid magnetron.

77. In combination, railway traflic governing mechanism including amagnetron, a track circuit, and means controlled by the our-- rent insaid track circuit for magnetically afl'ecting said magnetron.

78. In combination, railway traflic governing mechanism including a.magnetron, and trafic controlled means for impressing a magnetic ux onsaid magnetron.

79. A ailway traflic controlling system comprisin a ma netron, a trafliccontrolling circuit inc uding said magnetron, and trafiic controlledmeans for impressing a magnetic flux on said magnetron to efiect theoperation of said circuit. 1

80. In combination, a ra1lway traflic controlled circuit including anelectron discharge device of which'a magnetic field is a controllingcomponent, and traffic controlled means for magnetically influencingsaid device for affecting said circuit.

81. Railway traflic controlling apparatus comprising traflic governingmeans, and a magnetr on for controlling the operation of said means.

82. In a railway traflic controlling system, in combination, a railwaytrack, a vehicle thereon, trackwa means for producing mag netic'effects, a plurality of vacuum tube devices on saidvehicle responsive tosaid magnetic'efi'e'cts, a circuit associated with each of said devices,a translating device controlled by said circuits and means wherebyonefof said vacuum tube devices operates to deenergize said translating.-device and the other vacuum tube device operates to energize saidtranslating device.

83.- ;In combination, a rail-way track, a vehicle thereon, a magneticfield produced on the trackway by direct current, apole changer.controlling the polarity of said field, a space current device on saidvehicle, a circuit on said vehicle associated with said space currentdevice, a translating device operatively connected with said circuit andmeans in-,

cluding said space current device for operating said translating devicein response to the polarity of said field.

' In a railway trafli'c controlling system.

in combination, a railway track, a vehicle thereon, a magnetic fieldproduced on the trackway by direct current and controlled by traflicconditions, a pole changer controlling the polarity otsaid field, a cabsignal on said vehicle, a space current device controlling said signaland arranged to, give a proceed indication when said track'j field ismagnetized with one olarity and to give a caution signal when said trackfieldis magnetized with the polarity in the opposite direction 85. In arailway trafic controlling system, in, combination, a railway track, avehicle thereon, a magnetic field produced on the trackway by directcurrent and controlled by tratlic conditions, a pole changer controllingthe polarity of said field, a space current device on said vehiclecontrolling a circuit, said device responsive to said track field andmeans for obtaining one effect on said vehicle when said track field isenergized by 1 current of one polarity and for obtaining a differenteifect when said track field is energized by current of oppositepolarity.

86. In combination, a railway track, a ve hicle thereon, a ma neticfield on the trackway produced by irect current and controlled bytraflic conditions, a plurality of sponse to the polarity of the currentenergizing said field.

88. In combination, a railway track, a vehicle thereon, trackway meansproducing a magnetic field controlled by trafiic conditions,

' a pluralityof electron tube devices on'said in response to thepolarity of the current, energizing said field.

.netic effects, a plurality of'e vehicle independently responsive tosaid trackway field, a circuit directly associated with both of saidelectron tube devices and a translating device operated solely by saidcircuit to the proceed position. 89. In a railway trafiic controllingsystem,

theco'mbination, a railway track divided into "blocks, a vehiclethereon, trackway means energized by a single circuit producing a'{magnetic field,said single circuit controlled by said blocks,anelectron tube device on said vehicle controlled by said single circuit,a circuit associated with said electron tube device, a translatingdevice controlled only by said last named circuit and means associatedwith said translating device operating 90.v Ina railway trafliccontrolling system, in combination, a railway track, a vehicle thereon,trackway means for producing magvices on said vehicle responsive to saidmagnetic eifects,a circuit associated with'each of said devices, atranslating device controlled,

by said circuit, said electron tube devices being so connected that oneof said devices operates to deenergize said translating device ectrontube dewhile the other device operates simultaneously to energize saidtranslating device.

91. In a railway trafficcontrolling system, in combination, a railwaytrack, a vehicle thereon, a device on the trackway controlled by traificconditions, a device on the vehicle inductively responsive to saidtrackway device, a normally energized relay on the vehicle controlled bysaid vehicle device and deenergizedbysaidtrackway device, a translatingdevice on said 'vehicle electrically energized in the proceed position,a second relay on said vehicle operated by said track device and whenenergized closing a circuit to energize the first mentioned relay, saidrelays controlling said translating device and means whereby the circuitof said translating device is established by a back contact on saidsecond relay in the deenergized position.

92. In a railway trafiic controlling system,

*in combination, a railway track, a vehicle thereon, a device on thetrackway controlled by traffic conditions, a device on the vehicleinductively responsive to said trackway device, a normally energizedrelay on the vehicle controlled by said vehicle device and deenergizedby said trackway device, a translating device on said vehicleelectrically energized in the proceed position, a second relay on saidvehicle which, when energized, closes a circuit to energize the firstnamed relay and when deenergized operating by a back contact to close acircuit to said;trans- 'lating device.

93. In a railway trafiic controlling system, in combination, a railwaytrack, a vehicle thereon, a device on the trackway controlled by trafiicconditions, a device on the vehicle inductively responsive to saidtrackway device,a normally energized relay on said vehicle controllingits own circuit and controlled by said vehicle device and deenergized bysaid trackway device, a translating device on said vehicle electricallyenergized in the proceed position, a second relay on the vehiclearrangedto shunt the control of the normall energized relay where it iscontrolled y itself and when deenergized, operating to establish thecircuit of said translating device.

94. In a railway traflic controlling system,

'in'combination, a railway track, a vehicle thereon, a device on thetrackway controlled by trafiic conditions, a device on said vehicleinductively responsive to said trackway device, a normally energizedrelay on said vehicle controlled by said vehicle device and deenergizedby said trackway device, a second relay on said vehicle controlling saidnormallyenergized relay and a translating device on said vehiclecontrolled by saidnor mally energized relay in the proceed position andsaid second relay in the deenergized position to operate saidtranslating deviceto the proceed position.

Ill)

- 95. In a train controlling system, the combination, a vehicle with acontrolling mechanism having an operative and an inoperative position, adevice for. resetting said mechanism from the operative to theinoperative position and means co-operating with the inertia of saiddevice for operating said mechanism to the inoperative position.

96. In a train controlling system, the combination, a vehicle with acontrolling mechanism, a circuit controlling said mechanism, an electrontube controlling said circuit and operating to close said circuit whenenergized below a critical value. and operating to open said circuitwhen energized above this value and m'eans on'the trackway forenergizing said tube.

97. In combination, a railway trafiic= governing mechanism, a circuitcontrolling said mechanism, an electron tube controlling said circuitand operating to complete said circuit when energized below a criticalvalue and 'operating to open saidcircuit when energized above thisvalue.

' 98. Railway trafiic controlling apparatus comprising traflic governingmeans, a circuit controlling said means and a magnetron controllin saidcircuit and arranged to open said circuit when energized above acritical value.

99. In a train controlling system, the combination, a, track with avehicle thereon,- a deconditions, ardevice on the vehicle responding' tosaid trackway device, a controlling mechanism on said vehicle andacircuit comtrolling said mechanism, said vehicle device controllingsaid circuit and operating tolcom-i plete said circuit when energized bew 'a-crit-v ical value and operatin to open sai circuit when, energizedabove t e -cr1t1cal value.-

100 In a railway trafiic controllingrsys' tem, the combination, arailway-ftrack vided into blocks, trackway means energized by a singlecircuit for, producing a magnetic field having differentcharacteristics. controlled by said blocks, an electron tube device onsaid-vehicle respondin to said magnetic field, a circuit controlle bysaid elecvice. on the trackway controlled by traffic changing itscharacteristics in accordance single circuit for producing a magneticfield havi different characteristics controlled by sald blocks, anelectron tube device on said vehicle respondin to said magnetic field, acircuit control ed b -said electron tube device in accordance wit thecharacteristics' of said field and a translating device controlled onlyby the last named circuit and selectively responsive to saidcharacteristics.

102. In a railway trafiic controlling system, in combination, a railwaytrack divided into blocks, trackway means energized solely by a singlecircuit for producing a magnetic field having difierent characteristics,said circuit controlled by a plurality of said blocks, an electron tubedevice on said vehicle responding tosaid magnetic field, a cirteristicof said circuit, an electron tube device on said vehicle responding tosaid magnetic field, a circuit on said vehicle controlled 7 by saidelectron tube in accordance with the characteristic of thecurrentenergizing said trackway means and a translating devicecontrolled by said vehicle circuit in accordance with traflic conditionsin said'block.

104. In a railway traflic controlling system, in combination; a-railwaytrack divided into blocks, a track circuit with a track rela'y for eachblock, arelay controlled by a plurality of said track relays, trackwaymeans energized by an electric circuit for producing a magnetic field,said last named relay controlling said electric circuit and with trafficconditions in said blocks, a single electron tube device on said vehicleinductively responsive to the magnetic field of said trackway means,a-circuifi on said vehicle controlled by said electron tube device inaccordance with the characteristic of the circuit energizing saidtrackway means and a translating device selectively operated b saidvehicle circuit in accordance with tra fic conditions in said blocks.

' 105. In a railway traflic controllin .sys-.

tem, in combination, a railway track dlvided into blocks, a trackcircuit with a track relay for each block, trackway means energized byanelectric circuit for producing a magnetic field, said circuitcontrolled by a plurality of said track relays, to change itscharacteristics in accordance with changes in traflic conditions in saidblocks, a single electron tube device on said vehicle inductivelyresponsive to the magnetic field of said trackwa means, a circuit onsaid vehicle contro led by said electron tube device in accordance withthe characteristics of the circuit energizing said trackway means and asignal device controlled by said vehicle circuit and arranged to changeits indication as the 106. In a railway traflic controlling sys-.

term, in combination, a railway track, trackway means energized solelyby a slngle C11- cuit for producing a magnetic field, means on thetrackway controlling said circuit to change its characteristics, avehicle on said track having an electron tube device inductivelyresponsive to the magnetic field. of said trackway in accordance withthe characteristics of the circuit energizing said trackway means and atranslating device having a plurality of energized conditionsselectively controlled by said vehicle circuit. i

107. In a railway traflic controlling system, in combinatiom'a railwaytrack, trackway means energized by a circuit for producing a magneticfield, means on the trackway controlling said circuit to change itscharacteristics, a vehicle on saidtrack, an

electron tube device on said; vehicle respon sive to the magnetic fieldof said trackway -means, a circuiton said f vehicle controlled by saidelectron tube device in accordance with the characteristics of thecircuit energizin said trackway means and aItr'anslating evice having aplurality of energized conditions controlled only by said vehiclecircuit and selectively responsive to said I hicle thereon, a device thetrackway concharacteristics.

108. In a railway traflic controlling system, in combination, a railwaytrack, a vehicle thereon, a device on the trackway controlled by trafficconditions, a device on said vehicle inductively responsive to saidtrackway device, a normally energized relay on said vehicle controlled bsaid vehicle device and deenergized, by sai trackway device, asecond'relay on 'said vehicle controlling said normally energized relay,a translating device on said vehicle energized the roceed position, acircuit for energizi'j sai translating device and means foresta lishingnditions for closing said circuit by a contact on said normallyenergized relay in the energized position and'a contact on said secondrelay in the deenergized position.

4 109. Ina railway. traflic controllingisy's tem, incombinationfarailway track, a vetrolled by trafiic conditions, a deviceon said vehicle inductively jres onsive tosaid trackwayfidevice a,normaly energized relay on said vehiclecontrolled 1') said" vehicledevice and deenergized b ,asai trackway device' a,

second relay on said vehicle controlling sa d normally energized relayand. a translating device on said-vehicle having a pluralit of energizedconditions,'. circuits for controlling said translatingdevice and meansfor estab llshmg'conditions for closing said circuits by saidnormally-energized lrelay in the enercans, a circuit on the ve'-:

hicle controlled y said electron tube device F gized establishingconditions for a clear sigi nation track divided into blocks, means onthe trackway selectively controlled by said blocks in relay in the Isaid trackway means, a cab signal on said ve hicle giving clear, cautionand stop indications, a relay on said vehicle selectively controlled bysaid trackway means through said inductive responsive means and whenenernal and when deenergized establishing conditions for the display ofthe caution signal.

111. In a train control system, in combination, a track with a vehiclethereon, trackway means selectively controlled by traffic conditions,means on said vehicle including a single electron tube deviceinductively responsive to said trackway means, a relay on said vehicleselectively controlledby said trackway means through said inductiveresponsive means, a second relay on sald vehicledeenergized by saidtrackway means, a translating device on said vehicle having a proceedposition established by an energized circuit, and means for establishingthe circuit of said translating device by said first named relaydeenergized and by said second named relay energized. I

112. In a train control system, in combination, a track with a. vehiclethereon, trackway means selectively controlled by trafiic conditions,means on said vehicle including a single electron tube deviceinductively responsive to said trackway means, a translating device onsaid vehicle having a proceed position established by an energizedcircuit, a pair of relays on said vehicle one of which is selectivelyconfi'olled by said trackway device through said vehicle means and meansfor establishing the circuit of said translating "device by one of saidrelays in the energized position and the other in the deenergizedimsition.

113. In a train control system, in. combination, a track with a vehiclethereon, trackway means selectively lcontrolled by trafiic conditions,means on said vehicle including an electton tube deviceinductivelyresponsible to said trackway means, a translating device onsaid vehicle controlled by anelectric circuit, a pair of relays on saidvehicle controlledlby said. trackway means through said vehiclle meansand at least oneof said rela s beingselective 1y responsible to saidtrac way cans and means for establishing the circuit of said translatingdevice when said selectively operated relay is in the deenergizedposition and theother relay is energized.

114. In a train control system, incombir a track with a vehicle thereon,said accordance with traflic conditions, means on said vehicle includingan electron tube device inductively responsive to said trackway means, asignal device on said vehicle giving a caution and a stop indication,electric circuits controlling said signal device, a pair of relays onsaid vehicle controlled by said trackway means through said vehiclemeans and at least one of said relays being selectively responsible tosaid trackway means in accordance with trafiic conditions and means forestablishing'the circuit for the caution indication of said signal by aback contact on the selectively responsive relay and by afront contacton the other relay.

115. In a train control system, in combination, a track with a vehiclethereon, said track divided into blocks, means on the trackwayselectively controlled by -said blocks in accordance with trafficconditions, means on said vehicle inductively responsive to saidtrackway means, a signal device on said vehicle giving a caution and astop indication,

electric circuits controlling'said signal de vice, a pair of relays onsaid vehicle controlled by said trackway means through said vehiclemeans and at least one of said relays being selectively responsive tosaid trackway means in accordance with traflic conditions, the C11- cuitfor the caution indicationof said signal device being established by aback contacton the selectively responsive relay and by a front contacton the other relay and the circuit for the stop indication of saidsignal device being established by a back contact on the said otherrelay.

Signed at New York city, in the county of New York, and State of NewYork, this 28th day of September A. D. 1921.

JOHN S. HOLLIDAY.

